#include <iostream>
#include <string>

using namespace std;

void solve(const char *s)
{
    const char a[] = "abcdefghijklmnopqrstuvwxyz";
    for (int n = 0; n < sizeof(a); n++) {
        if (s[n] != a[n]) {
            cout << a[n] << "to" << s[n] << endl;
        }
    }
}

int main()
{
    string text;
    cin >> text;
    solve(text.c_str());
}