#include <stdio.h>
#include <cmath>
#include <algorithm>
#include <cfloat>
#include <stack>
#include <queue>
#include <vector>
#include <string>
#include <iostream>
#include <set>
#include <map>
#include <time.h>
typedef long long int ll;
typedef unsigned long long int ull;
#define BIG_NUM 2000000000
#define MOD 1000000007
#define EPS 0.000000001
using namespace std;

#define LIMIT 1000


enum Type{
	NONE,
	NUMBER,
	OPEN,
	CLOSE,
	ALPHABET,
	POWER,
	SPACE,
	PLUS_MINUS,
};


ll value[3][26],simpson[3];
char buf[1001],mid[20000],line[20000];

ll calc_line(){

	ll n,tmp,op1,work,count,work2;
	char calc;
	stack<ll> NUM,work_num;
	stack<char> OP,work_op;

	bool numFLG,negFLG;

	tmp = 0;
	numFLG = false;
	negFLG = false;

	for(int k = 0; line[k] != '\0'; k++){
		if(line[k] >= '0' && line[k] <= '9'){
			numFLG = true;
			tmp = 10*tmp + (line[k] - '0');

		}else{

			if(numFLG == true){

				if(negFLG){
					tmp = -1*tmp;
					negFLG = false;
				}

				if(OP.empty() == false && (OP.top() == '*' || OP.top() == '/')){
					calc = OP.top();
					OP.pop();
					op1 = NUM.top();
					NUM.pop();

					if(calc == '*'){
						NUM.push((tmp*op1)%MOD);
					}else{
						NUM.push(op1/tmp);
					}
				}else{
					NUM.push(tmp%MOD);
				}

				numFLG = false;
				tmp = 0;
			}

			if(line[k] == '+' ||line[k] == '*' || line[k] == '/' || line[k] == '('){
				OP.push(line[k]);
			}else if(line[k] == '-'){

				if(k == 0){
					if(line[k+1] != '('){
						negFLG = true;
					}else{
						NUM.push(-1);
						OP.push('*');
					}
				}else if(line[k-1] == '(' && line[k+1] == '('){
					NUM.push(-1);
					OP.push('*');
				}else if(k > 0 && (line[k-1] == '+' || line[k-1] == '-' || line[k-1] == '*' || line[k-1] == '/' || line[k-1] == '(')){
					negFLG = true;
				}else{
					OP.push('-');
				}
			}else if(line[k] == ')'){

				work = NUM.top();
				NUM.pop();
				work_num.push(work);

				count = 0;

				while(true){
					calc = OP.top();
					OP.pop();
					if(calc == '(')break;

					count++;

					work_op.push(calc);

					work = NUM.top();
					NUM.pop();
					work_num.push(work);
				}

				if(count == 0){
					work = work_num.top();
					work_num.pop();
				}else{

					work = work_num.top();
					work_num.pop();

					while(!work_num.empty()){
						calc = work_op.top();
						work_op.pop();

						if(calc == '+'){
							work += work_num.top();
						}else if(calc == '-'){
							work -= work_num.top();
						}else if(calc == '*'){
							work *= work_num.top();
						}else{
							work /= work_num.top();
						}
						work %= MOD;
						work_num.pop();
					}
				}

				if(OP.empty() == false && OP.top() == '*'){
					OP.pop();
					work2 = NUM.top();
					NUM.pop();
					work *= work2;
				}else if(OP.empty() == false &&OP.top() == '/'){
					OP.pop();
					work2 = NUM.top();
					NUM.pop();
					work = work2/work;
				}
				work %= MOD;

				NUM.push(work);

			}else{

				work = NUM.top();
				NUM.pop();
				work_num.push(work);

				while(!NUM.empty()){
					calc = OP.top();
					OP.pop();

					work_op.push(calc);

					work = NUM.top();
					NUM.pop();
					work_num.push(work);
				}

				work = work_num.top();
				work_num.pop();

				while(!work_num.empty()){
					calc = work_op.top();
					work_op.pop();

					if(calc == '+'){
						work += work_num.top();
					}else if(calc == '-'){
						work -= work_num.top();
					}else if(calc == '*'){
						work *= work_num.top();
					}else{
						work /= work_num.top();
					}
					work %= MOD;
					work_num.pop();
				}

				return (work+MOD)%MOD;
			}
		}
	}
	return -1; //must not reach here
}

void make_mid(){

	int mid_index = 0;
	char pre_ch;

	Type pre = NONE,current;

	for(int i = 0; buf[i] != '\n' && buf[i] != '\0';){

		switch(buf[i]){
		case ' ':

			while(buf[i] == ' ')i++;

			switch(buf[i]){
			case '(':
				current = OPEN;
				if(pre == NUMBER || pre == ALPHABET || pre == CLOSE){
					mid[mid_index++] = '*';
				}
				mid[mid_index++] = '(';
				break;
			case ')':
				current = CLOSE;
				mid[mid_index++] = ')';
				break;
			case '^':
				current = POWER;
				break;
			case '+':
			case '-':
				current = PLUS_MINUS;
				mid[mid_index++] = buf[i];
				break;
			case '\n':
			case '\0':
				break;
			default:
				if(buf[i] >= '0' && buf[i] <= '9'){
					if(pre == POWER){
						current = ALPHABET;
						for(int k = 0; k < ((buf[i]-'0')-1); k++){
							mid[mid_index++] = '*';
							mid[mid_index++] = pre_ch;
						}
					}else{

						if(pre == NUMBER || pre == ALPHABET|| pre == CLOSE){
							mid[mid_index++] = '*';
						}
						current = NUMBER;
						mid[mid_index++] = buf[i];
					}
				}else{
					current = ALPHABET;

					if(pre == NUMBER || pre == ALPHABET|| pre == CLOSE){
						mid[mid_index++] = '*';
					}
					mid[mid_index++] = buf[i];
					pre_ch = buf[i];
				}
				break;
			}
			i++;
			break;
		case '(':
			current = OPEN;
			if(pre == CLOSE || pre == NUMBER || pre == ALPHABET){
				mid[mid_index++] = '*';
			}
			mid[mid_index++] = '(';
			i++;
			break;
		case ')':
			current = CLOSE;
			mid[mid_index++] = ')';
			i++;
			break;
		case '^':
			current = POWER;
			i++;
			break;
		case '+':
		case '-':
			current = PLUS_MINUS;
			mid[mid_index++] = buf[i];
			i++;
			break;
		default:
			if(buf[i] >= '0' && buf[i] <= '9'){
				if(pre == POWER){
					current = ALPHABET;
					for(int k = 0; k < ((buf[i]-'0')-1); k++){
						mid[mid_index++] = '*';
						mid[mid_index++] = pre_ch;
					}
				}else{

					if(pre == ALPHABET || pre == CLOSE){
						mid[mid_index++] = '*';
					}
					current = NUMBER;
					mid[mid_index++] = buf[i];
				}
			}else{
				current = ALPHABET;

				if(pre == NUMBER || pre == ALPHABET || pre == CLOSE){
					mid[mid_index++] = '*';
				}
				mid[mid_index++] = buf[i];
				pre_ch = buf[i];
			}
			i++;
			break;
		}
		pre = current;
	}
	mid[mid_index] = '\0';
}

void make_line(int num){

	int line_index = 0;

	stack<char> S;

	for(int i = 0; mid[i] != '\0'; i++){

		if(mid[i] >= 'a' && mid[i] <= 'z'){

			int tmp = value[num][mid[i]-'a'];

			while(tmp != 0){
				S.push('0'+(tmp%10));
				tmp /= 10;
			}

			while(!S.empty()){
				line[line_index++] = S.top();
				S.pop();
			}
		}else{
			line[line_index++] = mid[i];
		}
	}
	line[line_index] = '=';
	line[line_index+1] = '\0';
}

void func(){

	make_mid();

	for(int i = 0; i < 3; i++){
		make_line(i);
		simpson[i] = calc_line();
	}

	bool FLG;
	ll tmp;

	while(true){
		fgets(buf,1000,stdin);
		if(buf[0] == '.')break;

		FLG = true;

		make_mid();

		for(int i = 0; i < 3; i++){
			make_line(i);
			tmp = calc_line();
			if(tmp != simpson[i]){
				FLG = false;
				printf("no\n");
				break;
			}
		}
		if(FLG){
			printf("yes\n");
		}
	}
	printf(".\n");
}


int main(){

	ll table[LIMIT];
	for(ll i = 0; i < LIMIT; i++){
		table[i] = 1;
	}
	table[0] = 0;
	table[1] = 0;

	for(ll i = 2; i <= sqrt(LIMIT); i++){
		if(table[i] == 1){
			for(ll k = 2*i; k < LIMIT; k += i){
				table[k] = 0;
			}
		}
	}

	ll prime[LIMIT],prime_index = 0;
	for(ll i = 2; i < LIMIT; i++){
		if(table[i] == 1){
			prime[prime_index++] = i;
		}
	}

	for(ll i = 0; i < 3; i++){
		ll base = 7*(i+1);

		for(ll k = 0; k < 26; k++){
			value[i][k] = prime[base+k];
		}
	}


	while(true){
		fgets(buf,1000,stdin);
		if(buf[0] == '.')break;

		func();
	}

	return 0;
}