charAt循环前两个数字不能循环它

import cs1.Keyboard;

public class charAT {
    public static void main(String[] args) {
        String s;

        //The telephone number should be 79575757
        System.out.println("Enter your telephone number");
        s = Keyboard.readString();

        int index1 = s.charAt(0);
import cs1.Keyboard;

public class charAT {