Remember to use this editorial only when stuck, and not to copy-paste code from it. Please be respectful to the problem author and editorialist.
Submitting an official solution before solving the problem yourself is a bannable offence.

n = int(input())
s = input()
for i in range(0, 2*n, 2):
    if s[i] == "T":
        print("R", end = "")
    else:
        print("L", end = "")