#include<iostream>
using namespace std;
int main()
{int n,a,i=0,maxn=0,maxn1=100,br1=0,br=1,ed,des,st;
cin>>n;
while(i<n)
{cin>>a;
if(a<0)a=a*-1;
if(a<10)ed=a;
else if(a>10&&a<100){ed=a%10;des=a/10;}
else {ed=a%10;des=a/10%10;st=a/100;}
if(ed==br1)br++;
else br1=ed;
if(des==br1)br++;
if(st==br1)br++;
if(br>maxn){if(br1<=maxn1){maxn1=br1;maxn=br;}}
i++;
}
cout<<maxn1<<endl;
return 0;}