#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <math.h>
int main(void)
{
    int times;
    int position=0,nextposition,dif;
    bool record=true;
    scanf("%d",&times);
    for(int i=0;i<times;i++)
    {
        scanf("%d",&nextposition);
        dif=position-nextposition;
        if(dif==1||dif==-1)
        {
            position=nextposition;
        }
        else
        {
            record=false;
            break;
        }
        
    }
    if(record==true)
    {
        printf("T");
    }
    else
    {
        printf("F");
    }
    
}