This problem can be solved by pre-school children in 5~10 minutes, by programmers in1 hour, by people with higher education ... well, check it yourself ! 8809 = 67111 = 02172 = 06666 = 41111 = 03213 = 07662 = 29313 = 10000 = 42222 = 03333 = 05555 = 08193 = 38096 = 57777 = 09999 = 47756 = 16855 = 39881 = 55531 = 02581 = ???