import java.util.Scanner; public class Test { public static void main(String[] args) {
        String str = add("4324242342", "246");
        System.out.println(str);
    } private static String add(String s1, String s2) {
        StringBuffer result = new StringBuffer();
        s1 = new StringBuffer(s1).reverse().toString();
        s2 = new StringBuffer(s2).reverse().toString(); int len1 = s1.length(); int len2 = s2.length(); int maxlen = len1 > len2 ? len1 : len2; boolean addTarget = false; int addNum = 0; if (len1 < len2) { for (int x = len1; x < len2; x++) {
                s1 += "0";
            }
        } else if (len1 > len2) { for (int x = len2; x < len1; x++) {
                s2 += "0";
            }
        } for (int x = 0; x < maxlen; x++) { char c1 = s1.charAt(x); char c2 = s2.charAt(x);
            String sc1 = c1 + "";
            String sc2 = c2 + ""; int nSum = Integer.parseInt(sc1) + Integer.parseInt(sc2); if ((nSum + addNum )>= 10) { if (x == maxlen - 1)
                    addTarget = true;
                result.append(nSum - 10 +addNum);
                addNum = 1;
            } else {
                result.append(nSum +addNum);
                addNum = 0;
            }
        } if (addTarget) {
            result.append(1);
        } return result.reverse().toString();
    }
}