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

// The main method must be in a class named "Main".
class Main {
    public static void main(String[] args) {
        // 1번 예시
        String message = "here is muzi here is a secret message";
        int[][] spoiler_ranges = {{0, 3},{23,28}};
        
        // 2번 예시
        //String message = "my phone number is 01012345678 and may i have your phone number";
        //int[][] spoiler_ranges = {{5,5},{25,28},{34,40},{53,59}};
        
        String[] words = message.split(" ");
        char[] chMsg = message.toCharArray();
        
        boolean[] spoArr = new boolean[chMsg.length];
        for(int i = 0; i < spoiler_ranges.length; i++) {
            for (int j = spoiler_ranges[i][0]; j <= spoiler_ranges[i][1]; j++) {
                spoArr[j] = true;
            }
        }
        //for(int i = 0; i < chMsg.length; i++) {
        //    System.out.print("*** ["+(i+1)+"] ***\n[CharMessage:"+chMsg[i]+" / SpoArr:"+spoArr[i]+"]\n");
        //}
        
        int wordIdx = 0;
        boolean isSpoiler = false;
        HashSet<String> spoiler = new HashSet<>();
        HashSet<String> nonSpoiler = new HashSet<>();
        
        for(int i = 0; i < chMsg.length; i++){
            char c = chMsg[i];
            if(c != ' ' && i != chMsg.length - 1){
                if(spoArr[i]){
                    isSpoiler = true;
                }
            }else if(c == ' ' || i == chMsg.length - 1){
                String word = words[wordIdx];
                if(!isSpoiler){
                    nonSpoiler.add(word);
                }else{
                    spoiler.add(word);
                }
                wordIdx++;
                isSpoiler = false;
            }
        }

        for(String ns : nonSpoiler){
            spoiler.remove(ns);
        }
        System.out.print(spoiler.size());
    }
}