//Problem Link : https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=24&page=show_problem&problem=2307
n=input()
while n!='0':
ans=0
c=int(n)
while c>9:
ans=0
for i in n:
ans=ans+int(i)
n=str(ans)
c=ans
print(c)
n=input()
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