UNPROTECTED PRIVATE KEY FILE! AWS EMR from terminal

Hello i am using itversity labs and trying to connect to aws emr from terminal but getting this error as shown below.please help.
[itv239451@g01 ~]$ ssh -i ~/sukanya_key.pem hadoop@ec2-13-127-118-190.ap-south-1.compute.amazonaws.com
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: UNPROTECTED PRIVATE KEY FILE! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Permissions 0644 for ‘/home/itv239451/sukanya_key.pem’ are too open.
It is required that your private key files are NOT accessible by others.
This private key will be ignored.
Load key “/home/itv239451/sukanya_key.pem”: bad permissions
Permission denied (publickey,gssapi-keyex,gssapi-with-mic).

Please provide the solution for this issue

run command
sudo chmod 400 sukanya_key.pem
and then try to login.