Fun with decimal number system

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Pratyush, a six year old kid has just learnt how to write 1 through 1000 in decimal number system(DNS). Being a very curious kid, he made some modifications in DNS and removed the digits 0 through 3 and 7 through 9. So the only digits remaining to be used are 4, 5 and 6. He started enumerating numbers with these digits in increasing order viz. 4, 5, 6, 44, 45, 46, 54, 55, 56, 64, 65, 66, 444 ... a

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solution.cppC++17

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