I want to keep records that look like this:
4866RUP
4145FRA
9943SSO
7071RTG
6896GDK
2148ghs
0283ryc
3668gdl
1408GOS
2291GTX
3789GPQ
Delete records like this:
46107087
9149
6360
1417
6080
7811
7276
9708
9562
7087
9149
6360
1417
6080
7811
7276
9708
9562