#include <iostream>
#include <cstring>
using namespace std;

int main()
{
    string str;
    cin >> str;
    int s = str.size();
    int i;
    string ans = str;
    string ans2 = ans;
    int changes = 0;
    int changesStart = 0;
    //cout << str << " " << ans << " " << ans2 << " ";
    for(i = 0; i < s; i++) {
        char c;
        if(str[i] == 'a')
            c = 'z';
        else
            c = str[i]-1;
        ans2[i] = c;
        if(ans2 < ans) {
            if(i == 0 || changes == 0) {
                ans = ans2;
                changes++;
                changesStart = i;
            }
            else {
                if(changesStart == i-1) {
                    ans = ans2;
                    changes++;
                    changesStart = i;
                }
                else
                    break;
            }
        }
        ans2 = ans;
    }
    cout << ans << endl;
    return 0;
}