80???

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n,c,i;
    string a;   
    cin>>n>>a;
    while(n>=26) n-=26;
    for(i=0;i<a.length();i++)
    {
        a[i]+=n;
        if(a[i]>'z') a[i]-=26;
        cout<<a[i];
    }
    return 0;
}