/*
 * bitops.c
 *
 *   carries out some bit operations on strings.
 */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int a [80], b [80], c [80];

void
or (void);

void
and (void);

void
xor (void);

void
print (void);

void
setup (char *s1, char *s2);

int
main (void)
{
	char s1 [85], s2 [85], op;

	while (gets (s1) != NULL) {
		gets (s2);
		op = s2 [0];
		gets (s2);

		setup (s1, s2);

		switch (op) {
		case 'O':
			or ();
			break;
		case 'X':
			xor ();
			break;
		case 'A':
			and ();
			break;
		}

		print ();
	}

	return 0;
}


void
or (void)
{
	int i;

	for (i = 0; i < 80; i++) {
		if (a [i] == 1 || b [i] == 1)
			c [i] = 1;
		else
			c [i] = 0;
	}
}

void
and (void)
{
	int i;

	for (i = 0; i < 80; i++) {
		if (a [i] == 1 && b [i] == 1)
			c [i] = 1;
		else
			c [i] = 0;
	}
}

void
xor (void)
{
	int i;

	for (i = 0; i < 80; i++) {
		if (a [i] == 1 && b [i] == 1)
			c [i] = 0;
		else if (a [i] == 0 && b [i] == 0)
			c [i] = 0;
		else
			c [i] = 1;
	}
}

void
print (void)
{
	int i, flag;

	flag = 0;

	for (i = 0; i < 80; i++) {
		if (c [i] == 1)
			flag = 1;

		if (flag) 
			printf ("%d", c [i]);
	}

	if (!flag)
		printf ("0");

	printf ("\n");
}

void
setup (char *s1, char *s2)
{
	int i, j;

	for (i = 0; i < 80; i++) {
		a [i] = 0;
		b [i] = 0;
		c[i] = 0;
	}

	j = 79;

	for (i = strlen (s1) - 1; i >= 0; i--) {
		a [j] = s1 [i] - '0';
		j--;
	}

	j = 79;

	for (i = strlen (s2) - 1; i >= 0; i--) {
		b [j] = s2 [i] - '0';
		j--;
	}
}