Keyboard Number Keys Error

Hi, new user & non-english speaker here, so If I do anything wrong please bear with me.

Suddenly when I am pressing the "1" key or even "Shift+1" on my keyboard it doesn't press at all but on pressing any key from "2 to 10" it automatically keeps on repeating "1s". Eg-If I press "3" then it keeps on repeating "31111111111111" until I press any other key. Similarly situation for "Shift+any number key". I reiterate that the problem is with only number keys and not adjoining keys on the same row. Please help.