#include <stdio.h>
#include <stdlib.h>

int main(int argc, char **argv, char **environ)
{
	int ret = 0;

	if(argc <= 1){
		char **ep;
		for(ep = environ; *ep; ep++)
			printf("%s\n", *ep);

	}else{
		int i;

		for(i = 1; i < argc; i++){
			char *env = getenv(argv[i]);

			if(env)
				printf("%s\n", env);
			else
				ret = 1;
		}
	}

	return ret;
}