Given a list of strings, find the list of characters that appear in all strings.
# Common characters in n strings:
def findAllC(list):
# Take every single characters in the strings in the list
chrs = set("".join(list))
out = []
for i in chrs:
# for each chrs in list count the chrs, if count is 0 break and repeat
for j in range(0, len(list)):
if list[j].count(i) == 0:
break
# at the end if is not break append the chrs in list
if j == len(list) - 1:
out.append(i)
return out
print(findAllC(['google', 'facebook', 'youtube']))
# ['o', 'e']