A space explorer's ship crashed on Mars! They send a series of SOS messages to Earth for help.
Letters in some of the SOS messages are altered by cosmic radiation during transmission. Given the signal received by Earth as a string, s, determine how many letters of the SOS message have been changed by radiation.
Example
The original message was SOSSOS. Two of the message's characters were changed in transit.
Function Description
marsExploration has the following parameter(s):
string s: the string as received on Earth
Returns
int: the number of letters changed during transmission
Video
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See the Pen Algorithm Mars Exploration
See the Pen Algorithm Mars Exploration by Vladimir Salguero (@vladisalguero) on CodePen.
