import java.io.*;
import java.util.StringTokenizer;

public class  WordCount4{
  private static void linecount(String fName, BufferedReader in) throws IOException{

  long numLine=0;
  long numWords = 0;
  String line;
    do{
      line = in.readLine();
      if (line != null){
        numWords += wordcount(line);
        numLine++;
      }
    }while(line != null);
  
    System.out.println("Number of words: " + numWords);
    System.out.println("Number of Lines: " + numLine);
    
  }

  private static long wordcount(String line){
  long numWords = 0;
  /*  int index = 0;
    boolean prevWhiteSpace = true;
    while(index < line.length()){
      char c = line.charAt(index++);
      boolean currWhiteSpace = Character.isWhitespace(c);
      if(prevWhiteSpace && !currWhiteSpace){
        numWords++;
      }
      prevWhiteSpace = currWhiteSpace;
    }*/
    return numWords;
  }
  public static void main(String[] args){
    
    long numLine=0;
    String line;
    try{
      if (args.length == 0)
      {
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        line = in.readLine();
        String reqword="is";
        int reqWordCount=0;
        StringTokenizer st = new StringTokenizer(line," ");
        int count = 0;
        int charcount=-1;
        while(st.hasMoreElements()){
            String word = st.nextToken();
                count++;
                charcount=charcount+word.length()+1;
                if(word.equalsIgnoreCase(reqword))
                {  
                    reqWordCount++;
                    
                    
                    System.out.println("pos"+(charcount-reqword.length()));
                }
                
            //System.out.println("word:"+word+" Char Count:"+word.length()+" Word No:"+count);
                
        }
        
        System.out.println("The word 'is' occures "+reqWordCount+" times");
      }
    }
    catch(IOException e){
      e.printStackTrace();
    }
  }
}