7.4.6

#include <iostream>
#include <algorithm>
#include <string>
#include <fstream>
#include <sstream>
#include <list>

using namespace std;
ifstream in("input.txt");
ofstream out("output.txt");

int main() {
    string s;
    int c = 0;
    int maxim = -10000000000000;
    getline(in, s);
    for (int i = 0; i < s.length(); i++) {
        if (s[i] <= 57 && s[i] >= 48) {
            c++;
        }
        else {
            maxim = max(c, maxim);
            c = 0;
        }
    }
    out << maxim;
}