=RIGHT(A1)
is quite sufficient (where the string is contained in A1).
Similar in nature to LEFT, Excel's RIGHT function extracts a substring from a string starting from the right-most character:
SYNTAX
RIGHT( text, [number_of_characters] )
Parameters or Arguments
text
The string that you wish to extract from.
number_of_characters
Optional. It indicates the number of characters that you wish to extract starting from the right-most character. If this parameter is omitted, only 1 character is returned.
Applies To
Excel 2016, Excel 2013, Excel 2011 for Mac, Excel 2010, Excel 2007, Excel 2003, Excel XP, Excel 2000
Since number_of_characters is optional and defaults to 1
it is not required in this case.
However, there have been many issues with trailing spaces and if this is a risk for the last visible character (in general):
=RIGHT(TRIM(A1))
might be preferred.