Crafty grandma edith sat her family down during and told them they couldn’t have any pumpkin pie until they worked out this puzzle. her 6-year-old granddaughter was the first to solve it! can you work out what 9183 equals?

8809=6
7111=0
9881=5
6660=4
5531=0
2516=1
3590=2
6855=3
1012=1
5731=0
9191=2
9183=?