Write a Python program that accepts input as a sentence in which all of the words are run together, but the first character of each word is lowercase and other letters in each word is uppercase. Convert the sentence to a string in which the words are separated by spaces, only the first word starts with an uppercase letter.

For example the string "isLEPTmOSToFtHEnIGHT." would be converted to "I slept most of the night."