Stealing Speshul's formula, this is a slightly shorter version (110)
[COLOR="#FFFFFF"]{=CHAR(LARGE(ISNUMBER(FIND(CHAR(ROW(97:122)),G2))*ROW(97:122),INT(RAND()*COUNT(FIND(CHAR(ROW(97:122)),G2))+1)))[COLOR]
I can't test it but I guess Xor's formula could use the same construct for the second arguement of the large function to save a character as well.
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