#include<stdio.h>
int main()
{
long int a, b, t;
while(scanf("%ld%ld", &a, &b)!= EOF)
{
if(b<a)
{
t = a;
a = b;
b = t;
}
printf("%ld\n", b - a);
}
return 0;
}
int main()
{
long int a, b, t;
while(scanf("%ld%ld", &a, &b)!= EOF)
{
if(b<a)
{
t = a;
a = b;
b = t;
}
printf("%ld\n", b - a);
}
return 0;
}
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