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#define _CRT_SECURE_NO_WARNINGS
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
void Error(char* msg){fprintf(stderr, "Error:%s\n", msg);  exit(1);}

int main(int argc, char* argv[]) 
{
int counter = 0; //variable that counts the appearances of the letters in the given name. 
int i;
int j;
char* name = argv[1]; //defining name variable
char* letters = argv[2];//defining letters variable
if(strlen(name) == 0 || strlen(letters) == 0)
	Error("either the name or the letters are empty\n");
if(argc != 3)
	Error("Bad number of parameters\n");
for(i=0;i<strlen(name);i++) // pass through all the letters in the given name.
{
	for(j=0;j<strlen(letters);j+=2) /* pass through all the letters and check if specific letter of the name shown in the string of the letters.*/
		{
			if(name[i] == letters[j]) /*if the letter found, updating the counter and get out of the second loop.*/
				{
				counter++;
				break;
				}
		}
}
if(counter==(strlen(name)))
	printf("\n%s exist\n\n", name);
else
	printf("\n%s not exist\n\n", name);
return 0;	
}