#encoding=utf-8
"""
把字符串中的所有数字去掉
"""
#方法一
def del_All_Nums1(s):
    have_no_num = ""
    for i in s:
        if "a"<=i<="z" or "A"<=i<="Z":
            have_no_num+=i
    return have_no_num
#方法二
def del_All_Nums2(s):
    n_s=list(s)
    have_no_num = ""
    for i in n_s:
        if i.isdigit():
            n_s.remove(i)
    return "".join(n_s)
s="a1b2c3b4d5dddddd"
print(del_All_Nums1(s))
print(del_All_Nums2(s))