#include<stdio.h>
int main()
{
int n, i=0, sum = 0, rem = 0, an[100];
while(scanf("%d", &n))
{
if(n == 0)
{
break;
}
an[i] = n;
while(an[i]>9)
{
while(an[i] != 0)
{
rem = an[i]%10;
an[i] = an[i] /10;
sum = sum + rem;
}
i++;
an[i] = sum;
sum = 0;
}
printf("%d\n",an[i]);
}
return 0;
}
int main()
{
int n, i=0, sum = 0, rem = 0, an[100];
while(scanf("%d", &n))
{
if(n == 0)
{
break;
}
an[i] = n;
while(an[i]>9)
{
while(an[i] != 0)
{
rem = an[i]%10;
an[i] = an[i] /10;
sum = sum + rem;
}
i++;
an[i] = sum;
sum = 0;
}
printf("%d\n",an[i]);
}
return 0;
}
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