#include <bits/stdc++.h>

using namespace std;
const int N = 105;
int q;
char str[N];

int main () {
	freopen("moocaozuo.in", "r", stdin);
	freopen("moocaozuo.out", "w", stdout);
	cin >> q;
	while (q--) {
		cin >> (str+1); int lth = strlen(str+1), s = 3;
		for (int i = 1;i <= lth-2;i++) {
			int c = 0;
			if (str[i+1] != 'O') continue;
			if (str[i] != 'M') c++;
			if (str[i+2] != 'O') c++;
			s = min(s, c);
		}
		if (s >= 3) cout << -1 << endl;
		else cout << s+lth-3 << endl;
	}
	return 0;
}