import sys                          
                                    
T = int(input())                    
x = [int(input()) for _ in range(T)]
                                    
if abs(x[0]) != 1:                  
    print("F")                      
    sys.exit()                      
                                    
for i, j in zip(x,x[1:]):           
    if abs(j - i) != 1:             
        print("F")                  
        break                       
else:                               
    print("T")