#include <bits/stdc++.h>

using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    string s;
    cin >> s;

    int counter = 0;
    for(int i=0; i < s.length()-1; i++)
    {
        if (s[i] != s[i+1])
        {
            s[i] = s[i+1];
            counter++;
            break;
        }
    }

    cout << counter;

    return 0;
}