read a b c
if [[ $c = "=" ]]; then
  if [[ $a = $b ]]; then
    echo YES
  else
    echo NO
  fi
elif [[ $c = "<" ]]; then
  if [[ $a < $b ]]; then
    echo YES
  else
    echo NO
  fi
else
  if [[ $a > $b ]]; then
    echo YES
  else
    echo NO
  fi
fi