q199024209

#include <iostream>

using namespace std;

int main()
{
    int n, x, s;
    cin >> n;

    x = n % 10;
    n /= 10;
    s = 0;

    while (n > 0)
    {
        if (n % 10 == x) s++;
        n /= 10;
    }

    cout << s;
    return 0;
}