Write the oxdation state of manganese :
mncl2
mno4
mno-4
http://www.chemteam.info/Redox/Redox-Rules.html
You need to find the caps key on your computer and use it.
CO is carbon monoxide
Co is cobalt
co is the abbreviation for company.
Mn is +2 in MnCl2. Follow those rules in the site I gave you.