#include <bits/stdc++.h>
#define i64 long long
using namespace std;
const int N = 500005;
char s[N];
int main(){
	int n;
	cin >> n;
	cin >> (s+1);
	int cntj = 0, cntoi = 0;
	for (int i = 1;i <= n;i++) {
		if (s[i] == 'J') {
			cntj++;
		} else if (s[i] == 'O' && s[i+1] == 'I'){
			cntoi++;
			i++;
		} else {
			for (int j = 1;j <= cntoi;j++) cout << "OI";
			for (int j = 1;j <= cntj;j++) cout << "J";
			cntoi = cntj = 0;
			cout << s[i];
		}
	}
	for (int j = 1;j <= cntoi;j++) cout << "OI";
	for (int j = 1;j <= cntj;j++) cout << "J";
	cntoi = cntj = 0;
}