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Here's my script

read number
if echo $number | grep "[0-9][^a-zA-Z]"

I want this "if" statement to return true only when numbers without letters is matched.
For example 45 - true, 923 - true,...

thanks, but as you see, in the second line there are no leading slash "/" before word "bash" and this script leaves space there :
almantas 31979 12082 0 00:00:06 pts/2 bash

I have following input:

almantas 31949 1 0 00:00:08 ? /usr/bin/pulseaudio -D --log-target=syslog
almantas 31979 12082 0 00:00:06 pts/2 bash
almantas 31991 31949 0 00:00:00 ? ...