#include <iostream.h>
int fun(char *,char *);
void main()
{
	char *p1,*p2;
	p1="abcfgy";
	p2="abcdhu";
    int n=fun(p1,p2);
	cout<<n<<endl;
}
int fun(char *s1,char *s2)
{
	while(*s1&&*s2&&*s1++==*s2++)
		;
    s1--;
	s2--;
	return *s1-*s2;
}