l, Java - rextester

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//'main' method must be in a class 'Rextester'.
//openjdk version '11.0.5'

import java.util.*;
import java.lang.*;

class Rextester
{  
    public static void main(String args[])
    {
        Scanner sc=new Scanner(System.in);
        String nm=sc.nextLine();
        nm=nm.trim();
        int ln=nm.length();
        int l,m,n;
        
        
        
        for(int i=ln-1;i>=0;i--)        // last space
        {
            if(nm.charAt(i)==' ')
            {
                l=i;
                break;
            }
        }
        
        
        for(int j=0;j<l;j++)            // first space
        {
          if(nm.charAt(j)==' ')
          {
              m=j;
              break;
          }
        }
        
     
        System.out.print(nm.charAt(0)+'.');
        
        System.out.print(nm.charAt(m+1)+'.');
        
        for(int q=l+1;q<ln;q++)
             System.out.print(nm.charAt(q));
        
            
        
        
        
        
             
    }
}

[ + ] Show input
Compilation time: 0.93 sec, absolute service time: 1,21 sec