题解 | #Digital Roots#
Digital Roots
https://www.nowcoder.com/practice/cef727d0af33479c9fb4a9c120702414
def root(d):
global arr,s
arr=[]
if d <=9:
return d
else:
while d>0:
arr.append(d%10)
d = int(d /10)
s = sum(arr)
return root(s)
while True:
try:
d = int(input())
print(root(d))
except:
break
