int main()
{
	char message[100], ch;
	int i, key = 1;

	printf("Enter a message to decrypt: ");
	scanf("%s",&message);

	for(i = 0; message[i] != '\0'; i++){
		ch = message[i];

		if(ch >= 'a' && ch <= 'z'){
			ch = ch + key;

			if(ch < 'a'){
				ch = ch + 'z' - 'a' + 1;
			}

			message[i] = ch;
		}
		else if(ch >= 'A' && ch <= 'Z'){
			ch = ch - key;

			if(ch < 'A'){
				ch = ch + 'Z' - 'A' + 1;
			}

			message[i] = ch;
		}
	}

	printf("decodedE NAricht: %s", message);

	return 0;