/* 
 * simple-calculator.
 */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>

int vars [5];

void
eval (char *s);

int
val (char var);

int
set (char dest, int val);

int
main (void)
{
	char s [100];
	int i;

	while (gets (s) != NULL) {
		eval (s);		
	}

	for (i = 0; i < 5; i++) {
		printf ("%c=%d\n", i + 'a', val (i + 'a'));
	}

	printf ("n=0\n");

	return 0;
}

void
eval (char *s )
{
	char dest;
	int op1, op2, v;
	char op, *ptr;

	dest = s [0];

	ptr = strstr (s, "+");

	if (!ptr)
		ptr = strstr (s, "*");

	op = *ptr;
	ptr++;

	if (isalpha (*ptr)) {
		op2 = val (*ptr);
	}
	else
		op2 = atoi (ptr);

	ptr = strtok (&s[2], "*+");

	if (isalpha (*ptr)) 
		op1 = val (*ptr);
	else
		op1 = atoi (ptr);

	switch (op) {
	case '+':
		v = op1 + op2;
		break;
	case '-':
		v = op1 - op2;
		break;
	case '*':
		v = op1 * op2;
		break;
	}

	printf ("%d\n", v);
	set (dest, v);
}

int
val (char var)
{
	if (var == 'n')
		return 0;
	else
		return (vars [var - 'a']);
}

int
set (char dest, int val)
{
	if (dest == 'n')
		return 0;
	else
		vars [dest - 'a'] = val;

	return val;	
}