#include <bits/stdc++.h>
using namespace std;

int main()
{
    cin.tie(0)->sync_with_stdio(0);

    string S;
    cin >> S;

    for (char c = 'a'; c <= 'z'; c++) {
        char cur = S[c - 'a'];
        if (c != cur) {
            cout << cur << "to" << c << endl;
        }
    }
}