#include <bits/stdc++.h>
using namespace std;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
char C, x;
cin >> C;
if (C == 'z') x = 'a';
else if (C == 'Z') x = 'A';
else x = C + 1;
cout << x << endl;
}
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