TRUE = 1
FALSE = 0


def SQ(x):
    return x * x


print('如果输入的数字小于 50，程序将停止运行。')
again = 1
while again:
    num = int(input('请输入一个数字：'))
    print(f'运算结果为: {SQ(num)}')
    if SQ(num) >= 50:
        again = TRUE
    else:
        again = FALSE