shell - Removing lines having special characters using awk command -

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i have text file sentences, words on each line. e.g. 

hello  hi  how you? % $ 9

i need remove lines above file contains non text characters. output should follows: 

hello  hi

i trying out using awk command follows:

awk '!/[%$0-9?]/' filename

i able above file because know special characters in above sentence. but, file has list of special characters difficult write in awk.

i tried out below commands keeps lines have both alphabets , special characters.

awk '/[a-za-z]/' filename

hence, please suggest me how write awk command keep lines don't have special characters or how keep lines have alphabets only.

thanks

awk '/^[a-za-z[:space:]]+$/' yourfile

note $ usage.


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