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1 solution
2 0 1 0 2 0 1 0 + 1 0 2 0 1 1 = ( 2 0 0 0 + 1 0 ) 2 0 1 0 + 1 0 2 0 1 1 = 2 0 0 0 2 0 1 0 + ⋯ + 1 0 2 0 1 0 + 1 0 2 0 1 1 As the number of digits will be given by the greatest number 2 0 0 0 2 0 1 0 and this finishes with zeroes, the number of digits is the same that the number of digits of 2 0 1 0 2 0 1 0