#include<bits/stdc++.h>
using namespace std;
int main(){
	freopen("candy.in","r",stdin);
	freopen("candy.out","w",stdout);
    int i=1;
    string a,b;
    char c,d;
    while(i<=10){
        ++i;
        cin>>a;
        if(a=="-1")
        break;
        cin>>b;
        c=a[a.size()-1];
        d=b[b.size()-1];
        if((c=='2'||c=='3'||c=='7'||c=='8')&&(d=='2'||d=='3'||d=='7'||d=='8'))
        cout<<"S"<<endl;
        else
        cout<<"M"<<endl;
    }
    return 0;
}