int i = 0, j = 0;
	
	while( av[1][i] != '\0' && av[2][j] != '\0'){
		
		int k = 0;
		int counter = 0;
		while(k < i){
			if(av[1][k] == av[1][i])
				counter++;
			k++;
		}
		
		if(counter != 0){
			i++;
			continue;
		}
		
		while( av[2][j] != '\0'){
			if( av[1][i] == av[2][j] ){
				counter++;
				break;
			}
			j++;
		}
		if(counter == 1)
			printf("%c", av[1][i]);
		
		i++;
		j = 0;
	}