def findAB (c):
    c = c multiplied by 100
    for a in 0..9: # or possibly 1..9
        for b in 0..9:
            set ab to a multiplied by 10 plus b
            if (ab multiplied by ab) is equal to (c plus ab):
                return (a,b)
    return nothing

c  |  a  |  b  |  ab  |  return
-----+-----+-----+------+----------
     |     |     |      |
     |     |     |      |
     |     |     |      |
     |     |     |      |

for a in range(1,10):
   for b in range(10):
       ab = a*10+b
       ab2 = ab*ab
       if (ab2 % 100) == ab:
           print "a=",a,", b = ",b