Area Code

#include <stdlib.h>
#include <string.h>
char isValid(char a[])
{	char c[27] = {'*','!','.',',',':',';','?','(',')','[',']','"','\'','<','_','-','/','1','2','3','4','5','6','7','8','9','0'};
	int valid = 0;
	for(int i = 0;i < strlen(a);i++)
		for(int j = 0;j < 42;j++)
			if(a[i] == c[j]) valid =-1;
	return (valid == -1)?printf("Invalid\n"):
				printf("Valid\n");	}
int main()
{	isValid("Ev1ryd*y");
	isValid("E**r***y");
	isValid("Everyday");
	isValid("Eve_1day");
	return 0;	}