/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
class Ex {
    public static void main(String[] args) {
      String vote = "ABBCCCBBAB";
        String answer = "";
        StringBuilder sb = new StringBuilder(vote);
        int aCnt = 0;
        int bCnt = 0;
        int cCnt = 0;
 
        for(int i = 0 ; i < sb.length() ; i++) 
        {
 
            if("A".equals(sb.substring(i,i+1)))
            {
                aCnt++;
            }
            else if("B".equals(sb.substring(i,i+1)))
            {
                bCnt++;
            }
            else if("C".equals(sb.substring(i,i+1)))
            {
                cCnt++;
            }
        }
        System.out.println(aCnt);
 
        System.out.println(bCnt);
        System.out.println(cCnt);
 
        if(cCnt >= sb.length()/2)
        {
            answer = "C";
        }
        else if(aCnt > bCnt)
        {
            answer = "A";
        }
        else if(bCnt > aCnt)
        {
            answer = "B";
        }
        else if(aCnt == bCnt)
        {
            answer = "AB";
        }
        System.out.println(answer);
    }
}

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