Given a string of digits, your task is to find the largest prime number which presents in that string. Our prime numbers are values between 2 to 100,000 only. Input Each line contains a string of digits (255 digits at most). The line contains only ‘0’ indicates the end which will not be processed. The input does not exceed 1,000 lines. Output Print out in each line the largest prime number found in each input string. Sample Input 11245 91321150448 1226406 0 Sample Output 11 1321 2