4564 + (a)   = 7357

1741 + (a)   = 4111

5678 + (a)   = 7110

2347 + (a)   = 7949

1401 + (a)   = 8970

5602 + (a)   = 9001

3471 + (a)   = 9240

2978 + (a)   = 4632

1569 + (a)   = 5853