codeforces 437A TheChildandHomework program in java

TheChildandHomework.java

import java.util.Scanner;
public class TheChildandHomework
{
    public static void main(String[] args)
    {
        Scanner z=new Scanner(System.in);
        int[] a=new int[4];
        for(int i=0;i<a.length;i++)
            a[i]=z.nextLine().length()-2;
        int k1=0;
        String x="";
        for(int i=0;i<a.length;i++){
            int k=0;
            int p=0;
            for(int j=0;j<a.length;j++){
                if(j!=i){
                    if(a[i]>=2*a[j])
                        k++;
                }
            }
            for(int j=0;j<a.length;j++){
                if(j!=i){
                    if(a[i]<=a[j]/2)
                        p++;
                }
            }
            if(k==3 || p==3){
                x+=Integer.toString(i);
            }
        }
        if(x.length()==1){
            if(Integer.parseInt(x)==0){
                System.out.println("A");
            } else if(Integer.parseInt(x)==1){
                System.out.println("B");
            } else if(Integer.parseInt(x)==2){
                System.out.println("C");
            } else if(Integer.parseInt(x)==3){
                System.out.println("D");
            }
        }
        else
            System.out.println("C");
        z.close();
    }
}