Write a program that reads a four-digit number from the keyboard as a string and then converts it into decimal. For example, if the input is 1100, the output should be 12. Hint: Break the string into characters and then convert each character to a value for a single bit (think about the Unicode, e.g. '0' has integer value 48, therefore '0'-48=0 ). If the bits are b0, b1, b2, and b3, the decimal equivalent is 8b0+4b1+2b2+b3 ¬. For example, 1100 = 8*1 + 4*1 + 2*0 + 0 =12.