#include <stdio.h>

int main()
{
int a,b,res;
while((scanf("%d %d",&a,&b)!=EOF))
{
if((a<0)&&(b<0))
break;

if((a==0)&&(b>50))
a=100;
else if ((b==0)&&(a>50))
b=100;

if(a>b)
{
    res=a-b;
    printf("%d\n",res);
}
else if (a<b)
{
    res=b-a;
    printf("%d\n",res);
}
}
return 0;
}