Doesn't seem possible

Let NN be the smallest positive integer for which the digit sum of NN and the digit sum of N+1N+1 are both divisible by 5050. How many digits of NN are 9?

Details and assumptions

The digit sum of a number is the sum of all its digits. For example the digit sum of 1123 is 1+1+2+3=71 + 1 + 2 + 3 = 7.

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