#include <iostream>
#include <cstring>
using namespace std;
main()
{
    char c;
    cin >> c;
    string s = "qwertyuiopasdfghjklzxcvbnm";
    for(int i = 0; i < 26; i++)
    {
        if(c == s[i])
        {
            if(i == 25)
                c = 'q';
            else c = s[i+1];
            break;
        }
    }
    cout << c;
}