Many a times certain keys on the keyboard may stop working and it becomes difficult for you to type. In such cases the only alternative is to buy a new keyboard.
There is an alternative though if you do not want to spend money on buying a new keyboard. To make use of this alternative you will have to turn the Num Lock to on and use the Alt key to type in the characters you want to.
For example when you can press and hold the Alt Key and type in 65 on the numeric keypad it will output the character "A". In this case the number 65 is the Keyboard shortcuts, alt key shortcuts, useful shortcuts