#include <stdio.h>

#define MAXBYTES 100000

void main(int argc, char *argv[])
{	
	unsigned int aflag=0;
	char buf[MAXBYTES];
	FILE *filep;

	fread(buf, sizeof(buf), 1, stdin);
	printf("%s", buf);

	if (argc > 1) for (int i=1; argv[i]; i++) {
		if (argv[i][0] == '-')
			switch(argv[i][1])
				case 'a': aflag = 1;
		else {
			if ((filep = fopen(argv[i], aflag? "a+":"w+"))==NULL) {
				fprintf(stderr, "tee: unable to write to %s\n", argv[i]);
				continue;
			}
			fputs(buf, filep);
			fclose(filep);
		}
	}
}