def isCMD(self):
	for word in msgstrlist:
	    if msgstrlist[0][0] == 'C':
		print word
	else:
	    print "Not CMD message

def isCMD(msgstrlist):
    for word in msgstrlist:
        if word[0].upper() == 'C':
            print word
        else:
            print "Not CMD message"
 
msgstrlist = ['Ox', 'Dog', 'Cow', 'mouse', 'cat']
 
isCMD(msgstrlist)
 
"""
my result -->
Not CMD message
Not CMD message
Cow
Not CMD message
cat
"""

def isOTHER(self):
	for word in msgstrlist:
	    if word[0].upper() not 'C' or 'R' or 'I'
		print "Other message has been found"
	    else:
		print "No other messages were found"

badletters = ['C', 'R', 'I']
 
# later on in your program...
 
if word[0].upper() not in badletters:
    print "Other message has been found"
else:
    print "No other messages were found"