I need your urgent help and guidance, I have a file in which there is 1000s of sequences , from which I want to cleave K and R and paste the remaining sequences line by line.
File A:

```
MSTNPKPQRK  TKRNTNRRPE  DVKFPGGQI

```

Desired Output:

```
MSTNP
PQ
T
NTN
PE
DV
FPGGQI

```

After getting this output I want to search individual sequences in file B (database of sequences)