it is:

#include <iostream>
#include <string>
#include <cstdlib> // for abs function

using namespace std;

int main() {
    string s;
    while (cin >> s) {
        for (int i = 0; i < 6; ++i) {
            int diff = abs(s[i] - s[i+1]);
            cout << diff;
        }
        cout << endl;
    }
    return 0;
}