#include <stdio.h>
#include <stdlib.h>

int main(int argc, char **argv)
{
    while(1)
    {
	char buf[256];
	int l=fread(buf,1,255,stdin);
	if(l==0)break;
	buf[l]=0;
	printf("grep: %s",buf);

    }

    return EXIT_SUCCESS;
}