#include<bits/stdc++.h>
using namespace std;
string s;
int ans;
int main(){
	freopen("moocaozuo.in","r",stdin);
	freopen("moocaozuo.out","w",stdout);
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int q;
	cin>>q;
	for(int j=1;j<=q;j++){
		cin>>s;
		if(s.length()<2){
			cout<<"-1"<<endl;
			continue;
		}
		ans=0x3f3f3f3f;
		for(int i=0;i<s.length()-2;i++){
			if(s[i]=='M'){
				if(s[i+1]=='O'){
					if(s[i+2]=='O'){
						ans=0;
					}
					else{
						ans=min(ans,1);
					}
				}
			}
			else{
				if(s[i+1]=='O'){
					if(s[i+2]=='O'){
						ans=min(ans,1);
					}
					else{
						ans=min(ans,2);
					}
				}
			}
		}
		if(ans==0x3f3f3f3f){
			cout<<"-1"<<endl;
		}
		else{
			cout<<ans+s.length()-3<<endl;
		}
	}
    return 0;
}