n_str = input("请输入一个自然数：")
n = int(n_str)
odd_num = 0 #奇数个数
even_num = 0 #偶数个数
total_num = 0 #总个数
print(n)
while(n != 123):
odd_num = 0
even_num = 0
total_num = len(n_str)
for i in n_str:
if(int(i) % 2 == 0): #偶数
even_num += 1
else:
odd_num += 1
n_str = str(even_num) + str(odd_num) + str(total_num)
n = int(n_str)
print(n_str)
