백준 10769 행복한지 슬픈지

https://www.acmicpc.net/problem/10769

10769번: 행복한지 슬픈지

inp = input()
happy, sad = 0, 0
i = 0
while 1:
    if i == len(inp):
        break
    if inp[i:i+3] == ":-)":
        happy += 1
        i += 3
    elif inp[i:i+3] == ":-(":
        sad += 1
        i += 3
    else:
        i += 1
if happy == 0 and sad == 0:
    print("none")
elif happy > sad:
    print("happy")
elif happy < sad:
    print("sad")
else:
    print("unsure")