For the A, buy John Pearce Loop End Silvered Plain Steel .011.
This will make your balalaika sound the way it was intended. You can find the strings on this site for a total price of $3.98. You're welcome.
1st A is correct
2nd and 3rd is "E "is same . MUST be black nylon diameter 0.95mm (apx. 0.040 inches)