#include<iostream>
#include<vector>
#include<stdio.h>
using namespace std;
bool imaLiQ[32];
int zaeto[32];
int main(){
freopen("keyboard.in","r",stdin);
freopen("keyboard.out","w",stdout);
int susedi[32][32] ={
/*1*/{2, 11},
/*2*/{1,11,12,3},
/*3*/{2,12,13,4},
/*4*/{3,13,14,5},
/*5*/{4,14,15,6},
/*6*/{5,15,16,7},
/*7*/{6,16,17,8},
/*8*/{7,17,18,9},
/*9*/{8,18,19,10},
/*10*/{9,19},
/*11*/{1,2,12,20},
/*12*/{2,3,13,21,20,11},
/*13*/{3,4,14,22,21,12},
/*14*/{4,5,15,23,22,13},
/*15*/{5,6,16,24,23,14},
/*16*/{6,7,17,25,24,15},
/*17*/{7,8,18,26,25,16},
/*18*/{8,9,19,26,17},
/*19*/{9,10,18},
/*20*/{11,12,21},
/*21*/{20,12,13,22},
/*22*/{21,13,14,23},
/*23*/{22,14,15,24},
/*24*/{23,15,16,25},
/*25*/{24,16,17,26},
/*26*/{25,17,18}
};
string str;
int a;
cin>>a>>str;
int currL=14, currR=17, indPurvaRazlichna,nL=14,nR=17;
for(indPurvaRazlichna=1;str[indPurvaRazlichna]==str[0];indPurvaRazlichna++){};
zaeto[currL]=str[0]-'a'+1;
zaeto[currR]=str[indPurvaRazlichna]-'a'+1;
imaLiQ[str[0]-'a'+1]=1;
imaLiQ[str[indPurvaRazlichna]-'a'+1]=1;
for(int i=indPurvaRazlichna+1;i<str.size();i++)
{
    if(imaLiQ[str[i]-'a'+1]==0)
    {
        imaLiQ[str[i]-'a'+1]=1;
        if(i%2==0)//left
        {
            bool slojihq=false;
            int nextt=0;
            while(!slojihq)
            {
                for(int j=0;susedi[currL][j]!=0;j++)
                {
                    if(zaeto[susedi[currL][j]]==0)
                    {
                        zaeto[susedi[currL][j]]=str[i]-'a'+1;
                        slojihq=1;
                        break;
                    }
                }
                if(!slojihq)
                {
                    if(susedi[nL][nextt]!=0)
                    currL=susedi[nL][nextt];
                    else
                    {
                        for(int j=1;j<27;j++)
                        {
                            if(!zaeto[j])
                            {
                                zaeto[j]=str[i]-'a'+1;
                                slojihq=1;
                                break;
                            }
                        }
                    }
                }
                nextt++;
            }
        }
        else//right
        {
            bool slojihq=false;
            int nextt=0;
            while(!slojihq)
            {
                for(int j=0;susedi[currR][j]!=0;j++)
                {
                    if(!zaeto[susedi[currR][j]])
                    {
                        zaeto[susedi[currR][j]]=str[i]-'a'+1;
                        slojihq=1;
                        break;
                    }
                }
                if(!slojihq)
                {
                    if(susedi[nR][nextt]!=0)
                        currR=susedi[nR][nextt];
                    else
                    {
                        for(int j=26;j>0;j--)
                        {
                            if(!zaeto[j])
                            {
                                zaeto[j]=str[i]-'a'+1;
                                slojihq=1;
                                break;
                            }
                        }
                    }
                }
                nextt++;
            }
        }
    }

}

for(int i=1;i<27;i++)
{
    if(!zaeto[i])
    {
        for(int j=1;j<27;j++)
        {
            if(!imaLiQ[j])
            {
                zaeto[i]=j;
                imaLiQ[j]=1;
                break;
            }
        }
    }
}
/*
for(int i=0;i<27;i++)
    cout<<i<<": "<<(char)(zaeto[i]+'a'-1)<<endl;
cout<<"iamliq\n";
for(int i=0;i<27;i++)
    cout<<i<<": "<<imaLiQ[i]<<"\n";
*/
/*
for(int i=1;i<27;i++)
{
        bool ok=false;
    for(int j=1;j<27;j++)
    {
        if(zaeto[j]==i)
        {
            ok=1;
            break;
        }
    }
    if(ok==false)
    {
        cout<<"qwertyuiopasdfghjklzxcvbnm\n"<<14<<" "<<17<<endl;
        return 0;
    }
}
*/

for(int i=1;i<27;i++)
    cout<<(char)(zaeto[i]+'a'-1);
cout<<endl;
cout<<14<<" "<<17<<endl;
return 0;
}