I have the following....

p=311 q=173

m= 53803

Euler Totient = 53320

k=3

message is the string of digits

232 524 141 135 192 911 331 529 252 315

a1= 232 a2= 524........a10=315

In the form a^k = = b (mod 53803)

I don't know how to find b....I have been going in circles for the past 4 hours and I can't get it... please help