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C437A.java
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C437A.java
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import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
public class C437A {
/***/
public static void main(String[] args) {
BufferedReader reader =new BufferedReader(new InputStreamReader(System.in));
try{
int[] lenChoices=new int[4];
String[] choices=new String[4];
for(int i=0;i!=choices.length;i++){
choices[i]=reader.readLine().trim().substring(2);
lenChoices[i]=choices[i].length();
}
Set<Integer> setResponses=Collections.synchronizedSet(new HashSet<Integer>());
for(int i=0;i!=choices.length;i++){
int min=Integer.MAX_VALUE;
int max=Integer.MIN_VALUE;
for(int j=0;j!=choices.length;j++){
if(i!=j){
int twiceShorter=lenChoices[j]/2;
int twiceLonger=lenChoices[j]*2;
min=Math.min(min, twiceShorter);
max=Math.max(max, twiceLonger);
}
}
if((lenChoices[i]<=min)||(lenChoices[i]>=max)){
setResponses.add(i);
}
}
if(setResponses.size()==1){
String[] respChoices={"A","B","C","D"};
System.out.println(respChoices[setResponses.iterator().next()]);
}else System.out.println("C");
reader.close();
}catch(Exception e){}
}
}