题解 | 竞选社长

#include <stdio.h>

int main() {
	char mark = ' ';
	int i = 0, numA = 0, numB = 0;
	while (scanf("%c", &mark) != EOF) {
		if (mark == 'A')
			numA++;
		if (mark == 'B')
			numB++;
	}
	if (numA > numB)
		printf("A");
	else if (numA < numB)
		printf("B");
	else
		printf("E");
	return 0;
}