A Riddle
As this riddle was described to me, a 4 year old will solve it in 5-10 minutes, a programmer will solve it in an hour, and you will solve it in.....
9313 = 1
7756 = 1
6855 = 3
9881 = 5
8096 = 5
7111 = 0
2172 = 0
6666 = 4
1111 = 0
3213 = 0
7662 = 2
5531 = 0
2222 = 0
7777 = 0
9999 = 4
8809 = 6
0000 = 4
3333 = 0
5555 = 0
8193 = 3
2581 = ???
Spoiler buffer.
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