#include<stdio.h>
void main(){
	int n;
	for(;;){
		scanf("%d",&n);
		while(n!=0){
			n=n/10000+n/1000-10*(n/10000)+n/100-100*(n/10000)-10*(n/1000)+n/10-1000*(n/10000)-100*(n/1000)-10*(n/100)+n-10000*(n/10000)-1000*(n/1000)-100*(n/100)-10*(n/10);
			if(n/10==0)
				break;
		}
		if(n==0)break;
		else
			printf("%d\n",n);
	}
}

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