#include <iostream>
using namespace std;

const int sizeM = 4;

int checkStr(char s[], char m[]) {
	int i = 0;
	int acc = 0;
	int biggest = 0;
	while (s[i] != '\0') {
		bool marked = false;
		for (int j = 0; j < sizeM; j++)
		{
			if (m[j] == s[i]) {

				acc++;
				marked = true;
				if (acc > biggest) {
					biggest = acc;
				}
			}
		}
		if (marked == false) {
			acc = 0;

		}

		i++;

	}
	return biggest;
}

int main()
{
	char m[] = { 'e','t','i','s' };
	char kur[] = "This is one test string!";

	cout << checkStr(kur, m);
}