Hi all,
We have a requirement like we need to create a program which will change a particular string in the file. For example

+=KA1238767 1121 3344645 686943 22356
01 567893 12435 12121 983627 121 1092 091217
02 may be for engine failure

In the above file we need to change the bold string to 56789C.
The new file will be as follows

+=KA1238767 1121 3344645 686943 22356
01 56789C 12435 12121 983627 121 1092 091217
02 may be for engine failure


The exact problem is the bold string may vary from time to time. It can be 145629 in that case the string which will be replaced with it is 14562I and so on. In general the last character needs to be changed to the corresponding alphabet. Eg.
1- A
2-B
3-C
4-D
5-E
....
9-I


Any type of suggestion or help will be highly appreciated.
Thank you in advance.

Regards
Susant