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s is just a variable:).

You can use p,q,r and so on instead of s. whichever you like...:D

We are just using s for storing the output.

echo "you are how Hi" | awk 'BEGIN{RS=" ";ORS=" "}{arr[NR-1]=$1;num++}END{for (i=num-1;i>=0;i--)print arr[i]}'