HIIT Generation

def replace(base,letter):
    base = str(base)
    length = len(base)
    for i in range(length):
        if base[i] == letter:
           result = base.replace(letter, "HIIT")
    return result

base_string = "HIIT"

n = int(input())

for i in range(n):
    letter = input()
    base_string = replace(base_string, letter)


print(base_string)

Test 1

Verdict: TIME LIMIT EXCEEDED

Test 2

Verdict: TIME LIMIT EXCEEDED

Test 3

Verdict: TIME LIMIT EXCEEDED

Test 4

Verdict: ACCEPTED