Write the function itob(n,s,b) that converts the integer n into a base b character representation in the string s. In particular, itob(n,s,16) formats s as a hexadecimal integer in s.
Use the digits 0 to 9 and then the lower case letters a to z, so b is from 2 to 36. Write a negative n as a minus sign followed by the digits of its magnitude. Each input line holds n and b, separated by a blank, with n fitting in an int. Print s on a line of its own.
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