[Python] 백준 10845번 - 큐

# 1722 순열의 순서
# 10845 큐
N = int(input())
queue = []
for i in range(N):
    command = input()
    if command.__contains__("push"):
        queue.append(command[-1])
    elif command.__contains__("pop"):
        if len(queue) != 0:
            val = queue.pop(0)
            print(val)
        else:
            print("-1")
    elif command.__contains__("size"):
        print(len(queue))
    elif command.__contains__("empty"):
        if len(queue) == 0:
            print("1")
        else:
            print("0")
    elif command.__contains__("front"):
        if len(queue) == 0:
            print("-1")
        else:
            print(queue[0])
    elif command.__contains__("back"):
        if len(queue) == 0:
            print("-1")
        else:
            print(queue[-1])