var4 2k16 22/2/2022

#include <iostream>

using namespace std;

int main() {
    int k = 1, m = 1, n;
    cin >> n;
    while (n > 9) {
        if (n % 10 == n / 10 % 10) {
            k++;
            if (k > m) {
                m = k;
            } else {
                k = 1;
            }
        }
        n /= 10;
    }
    cout << m << endl;
    return 0;
}