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