题解 | #添加逗号#
添加逗号
http://www.nowcoder.com/practice/f51c317e745649c0900996fd3f683aed
n=input()
n=n[::-1]
number=[]
cnt=1
for i in range(len(n)):
if cnt%3==0:
number.append(n[i])
if cnt<len(n):
number.append(',')
cnt+=1
else:
number.append(n[i])
cnt+=1
number=number[::-1]
for x in number:
print(x,end='')
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