Submission #66173241

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Source Code Expand

#include <stdio.h>
#include <limits.h>

char exists[1 << CHAR_BIT];

char S[1024];

int main(void) {
	int i;
	const char* alphabets = "abcdefghijklmnopqrstuvwxyz";
	if (scanf("%1023s", S) != 1) return 1;
	for (i = 0; S[i] != '\0'; i++) {
		exists[(unsigned char)S[i]] = 1;
	}
	for (i = 0; alphabets[i] != '\0'; i++) {
		if (!exists[(unsigned char)alphabets[i]]) {
			printf("%c\n", alphabets[i]);
			return 0;
		}
	}
	puts("ERROR");
	return 0;
}

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