/* package whatever; // don't place package name! */
import java.util.*;
import java.lang.*;
import java.io.*;
/* Name of the class has to be "Main" only if the class is public. */
public class HelloWorld{
public static void main
(String[] args
){
}
public static int lab6a
(String s
){ if(s.length()==0)
return 0;
if(s.charAt(0)=='a')
return 1+lab6a(s.substring(1));
else
return lab6a(s.substring(1));
}
}
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