echo "1+2+33" | awk '{print gensub(/([0-9])\+/,"\\1x","G",$0)}' | awk '{print gensub(/([0-9])\-/,"\\1+","G",$0)}' | awk '{print gensub(/([0-9])x/,"\\1-","G",$0)}' | python -c "print(eval(input()))"