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


char* array [100];

int main()
{
 char* token;
 int i;
 int pid;
 int result;
 char* input = NULL;
 for(i = 0; i < 100; i++)
 {
     array[i] = malloc(128);
 }
 while(1)
 {
  getline(&input;, NULL, stdin);
        token = strtok(input, " ");
        strcpy(array[0], token);
        i = 1;
        while((token = strtok(NULL, " ")) != NULL)
        {
            strcpy(array[i], token);
            i++;
        }
        array[i] = NULL;
        free(input);
        pid = fork();
        if(pid = -1)
        {
            puts("invalid fork.");
        }
        else if(pid > 0)
        {
            result = wait(pid);
            if(result != pid)
            {
                puts("wait failed.");
            }
        }
        else
        {
            result = execvp(array[0], array);
            puts("ERROR");
        }

 }
 for(i = 0; i < 100; i++)
 {
     free(array[i]);
 }
}