How to find the length of a number

[text] Return length of number tong long nunLenlong Long num it it it it ir ir ir ir ir ir ir ir ir it ir ir it it num num num num num num oum num num num num num num num hum num num num 0 66 nun 10 return 1 10 66 num 100 return 100 86 num 1006 return 1000 6 num 10000 return 4 10000 66 num 100000 return 5 106600 num 1660060 return 6 1008900 6 num 10000000 return 7 10000000 86 num 1000000 return 8 100800000 66 num 1890000000 return 9 1000000000 num 10000000000 return 10 90000000 return 11 100000000000 56 nun 1000000000000 return 12 1000060000000 num 10090000000000 return 13 10009000000090 66 num 109000090990000 return 14 100000000006000 num 1000000000060000 return 15 1000060000000900 nun 10009000000000000 return 16 10000600000009000 num 100000000000000000 return 17 100800000000000000 66 num 1000000000000006000 return 18