I have the following situation

Column A Column B Column C
M Project# R Project#
M0001 R133
M0002 R0060
M0003 R0096
M0004 R0113
M0005 R0153
M0006 R0157
M0007 R0279
M0008 R0280
How do I build a formula on Column C where each time the digits match (A,B)
to return the value existing on column B?

Ex:
Column A Column B Column C
M0008 = R0008 repeat R0008

Thank you so much in advance for your help.