这是,板子题,,,

#include <iostream>
#include <string>
#include <cstring>
#include <cstdio>
#define int long long
using namespace std;

int t;
string s;

int Read () {
    int i;
    cin >> i;
    return i;
}

signed main () {
    t = Read();
    
    while (t--) {
        cin >> s;
        
        if (s.back() == '0')
            puts("E");
        else
            puts("B");
    }
    
    return 0;
}

@览遍千秋