0
No googling, if you solve it post your answer (NOT THE EXPLANATION)
7110 = 1
8809 = 6
2172 = 0
6666 = 4
1111 = 0
2222 = 0
7662 = 2
9313 = 1
5555 = 0
8193 = 3
8096 = 5
4398 = 3
9475 = 1
9038 = 4
3148 = 2
2889 = ?