#include <stdio.h>
#include <stdlib.h>

int main(){
    int i, T;
    int walk[100];

    scanf("%d\n", &T);
    for(i = 0; i < T; i++){
        scanf("%d\n", &walk[i]);
        if(i > 0){
            if(abs(walk[i] - walk[i - 1]) != 1){
                printf("F\n");
                return 0;
            }
        }else{
            if(abs(walk[i] - 0) != 1){
                printf("F\n");
                return 0;
            }
        }
    }
    printf("T\n");

    return 0;

}