Например, в B1 используйте:
=TRIM(RIGHT(SUBSTITUTE(A1," ",REPT(" ",255)),255))
Проверьте, есть ли числа:
=COUNT(FIND({0,1,2,3,4,5,6,7,8,9},A1))>0
Объедините два в IF:
=IF(COUNT(FIND({0,1,2,3,4,5,6,7,8,9},TRIM(RIGHT(SUBSTITUTE(A1," ",REPT(" ",255)),255))))>0,TRIM(RIGHT(SUBSTITUTE(A1," ",REPT(" ",255)),255)),"")