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#include <iostream>
#include <cstdio>

using namespace std;

int main()
{
    char chars[4];
    int a = 0, n = 0;
    scanf("%d", &n);
    int count = 0;
    string out = "";
    for(int i = 0; i < n; i++){
        scanf(" %s%d", chars, &a);
        if(chars[0] == 'N'){
            continue;
        }
        if(count > 9 && a > 1){
            continue;
        }
        if(count >= 20){
            continue;
        }
        count++;
        printf("%d ", i + 1);
    }
    return 0;
}