#include<bits/stdc++.h>
#define LINT long long int
#define ULINT unsigned long long int
#define INF 99999999999

using namespace std;

template<typename tmp>
void input(vector<tmp>& vc) {
    for (tmp& x : vc)
        cin >> x;
}
template<typename tmp>
void output(vector<tmp>& vc, string endll = " ", string endd = "\n") {
    for (tmp& x : vc)
        cout << x << endll;
    cout << endd;
}

int main(){
    string s1, s2;
    cin >> s1 >> s2;
    vector<int> vc(s1.size(), 0);
    vector<int> ans (26, 0);
    for (int i = 0; i < s1.size(); ++i) {
        if (s1[i] == s2[i]) {
            vc[i] = 2;
        } else {
            ans[int(s1[i]) - int('A')] += 1;
            }
    }
    for (int i = 0; i < vc.size(); ++i) {
        if (vc[i] == 2) {
            cout << 'P';
        } else
            if (ans[int(s2[i]) - int('A')]) {
                ans[int(s2[i]) - int('A')]--;
                cout << 'S';
            } else
                cout << 'I';
    }
}