题解 | #竞选社长#

function getResult(array) {
    var suma = 0;
    var sumb = 0;
    for(let i = 0; i < array.length-1; i++) {
        if(array[i] == 'A') {
            suma = suma + 1;
        } else {
            sumb = sumb + 1;
        }
    }
    if(suma > sumb) {
        return 'A';
    } else if (suma == sumb){
        return 'E';
    } else {
        return 'B';
    }
}
var line = readline();
var str = line.split('');
console.log(getResult(str));