problema 1

def noNum(string):
# @param string: stringa
# @return string
 count= ''
 ch= 0
 while ch  < len(string):
   if not string[ch].isdigit() == True:
     count= count + string[ch]
     ch= ch + 1
 return count


def noNum1(string):
# @param string: stringa
# @return string
 count= ''
 ch= len(string)
 for ch in string:
   if (ch.isalpha()) == True:
     count= count + ch
 return count