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(X)y -> Number X with base y

For a number (r-1 r-1 r-1)r  of radix 'r' .        [Number of r-1 could be any here, I have limited to 3 as per question's demand]

eg- (111)2,(222)3,(333)4,(444)5,(555)6,(666)7,(777)8 ....etc  

They represent (r-1)'s complement of 0 in their respective radix system.

Adding 1 to such numbers evaluates to r's complement of 0 in their respective radix system.

So the numbers are,

(1000)2,(1000)3,(1000)4,(1000)5,(1000)6,(1000)7,(1000)8 ....etc

Adding 1 more will just go to LSB(as r>1)

(1001)2,(1001)3,(1001)4,(1001)5,(1001)6,(1001)7,(1001)8 ....etc

The answer is (1000)5 , (1001)5 .

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