import java.util.*;
class Main{
    public static void main(String args[]){
        Scanner s= new Scanner(System.in);
        String i=s.nextLine();
        if(hasNextInt(i)){
        for(int j=0;j<i.length();j++){
            char ch=i.charAt(j);
        
        if(Character.isDigit(ch)){
            
            System.out.println("true");
            break;
        }
        else{
            System.out.println("false");
        }
    }
}
else{
    System.out.println("false");
}
}
}