#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <wait.h>
#include <string.h>
#include <limits.h>

enum
{
    P_LEN = 5,
};

int
main(int argc, char **argv)
{
    if (argc <= 2) {
        return 0;
    }

    char *sep = argv[1];
    for (int i = 2; i < argc; ++i) {
        if (!strcmp(sep, argv[i])) {
            argv[i] = NULL;
        }
    }
    argv[1] = NULL;

    for (int i = argc - 1; i > 1;) {
        int j = i;
        while (argv[j]) {
            --j;
        }
        ++j;
        int arg_cnt = i - j;
        char **args;

        pid_t pid = fork();
        if (pid < 0) {
            _exit(1);
        } else if (!pid) {
            char *fname = argv[j];
            args = calloc(arg_cnt + 2, sizeof(*args));
            if (!args) {
                _exit(1);
            }
            args[0] = fname;
            for (int k = 1; k <= arg_cnt; ++k) {
                args[k] = argv[k + j];
            }
            args[arg_cnt + 1] = NULL;
            execvp(fname, args);
            _exit(1);
        } else {
            int status;
            wait(&status);
            if (!WIFEXITED(status) || WEXITSTATUS(status)) {
                exit(1);
            }
            i = j - 2;
        }
    }

    exit(0);
}