#include <iostream>
#include <string>
using namespace std;


int main() {
	string s;
	cin >> s;
	int n = s.length();
	int m = 0;
	int cnt = 1; 
	for (int i = 1; i < n; ++i) {
		if (s[i] == s[i - 1]) {
			cnt += 1; 
		} else {
			m = max(m, cnt);
			cnt = 1; 
		}
	}
	m = max(m, cnt);
	
	cout << m << endl;
	
	return 0;
}