read X
read Y
read Z

if [[ "$X" -eq "$Y" && "$Y" -eq "$Z" ]]; then
    echo "EQUILATERAL"
elif [[ ( "$X" -eq "$Y" && "$Y" -ne "$Z" )  || ( "$X" -eq "$Z" && "$X" -ne "$Y" ) || ( "$Y" -eq "$Z" && "$Y" -ne "$X" )  ]]; then
    echo "ISOSCELES"
else
    echo "SCALENE"
fi