removeLetter_removeNumber

def removeLetters(string):
#@param:
#   string: string;
#   return: string;
    s = ""
    for i in string:
        if not i.isalpha():
            s = s + i
    return s
#-------------------------------------------------------------------------------
def removeNumbers(string):
#@param:
#   string: string;
#   return: string;
    s = ""
    for i in string:
        if not i.isdigit():
            s = s + i
    return s
#-------------------------------------------------------------------------------