ex3 s10

# ex3
from numpy import *
t=array([str]*100)
t1=array([str()]*100)
def saisie():
    while True:
        n=int(input("n="))
        if 2<n<20: break
    return n
def remplir1(n):
    for i in range(n):
        while True:
            t[i]=input("t["+str(i)+"]:")
            if len(t[i])>0: break
    return t,n
def remplir2(m):
    for i in range(m):
        y=i+97
        t1[i]=chr(y)
    return t1,m
def commun(t,t1,n,m):
    ch=""
    for i  in range(m):
        s=0
        for j in range(n):
            if t[j].find(t1[i])!=-1 :
                s=s+1
        if s==n:
            ch=t1[i]+","+ch
    return ch[:-1]
def afficher(t1,m):
    for i in range(m):
        print(t1[i],end="/")
    print()
m=26
n=saisie()
t,n=remplir1(n)
t1,m=remplir2(m)
afficher(t1,m)
print("les caractéres communs sont:", commun(t,t1,n,m))