#include <stdio.h>
#include <stdbool.h>

void main(void){

	int n = 0;	 
    scanf("%d",&n);
    int positionList[n+1];
    positionList[0] = 0;
    for(int i = 1 ; i <= n ; i++){
        scanf("%d",&positionList[i]);
    }
    bool moveFlg = true;
    for(int i = 0 ; i < n ; i++){
        if(positionList[i+1]-positionList[i] != 1 && positionList[i+1]-positionList[i] != -1 ){
            moveFlg = false;
            break;
        }
    }
    if(moveFlg){
        printf("T");
    }else{
        printf("F");
    }
}