tictactoe grid

x1=1
x2=2
x3=3
x4=4
x5=5
x6=6
x7=7
x8=8
x9=9
x="X"
o="O"
a=0
print("press any letter to end the program")
print(".")
print(".")
print(".")
print("press a number from the grid to play")
print(x1,"!",x2,"!",x3)
print("---------")
print(x4,"!",x5,"!",x6)
print("---------")
print(x7,"!",x8,"!",x9)
while a < 9:
    print("o move")
    y = int(input())
    if y == x1:x1=o
    if y==x2:x2=o
    if y==x3:x3=o
    if y==x4:x4=o
    if y==x5:x5=o
    if y==x6:x6=o
    if y==x7:x7=o
    if y==x8:x8=o
    if y==x9:x9=o
    print(x1,"!",x2,"!",x3)
    print("---------")
    print(x4,"!",x5,"!",x6)
    print("---------")
    print(x7,"!",x8,"!",x9)
    a=a+1
    if a<9:
        print("x  move")
        c = int(input())
        if c == x1:x1=x
        if c==x2:x2=x
        if c==x3:x3=x
        if c==x4:x4=x
        if c==x5:x5=x
        if c==x6:x6=x
        if c==x7:x7=x
        if c==x8:x8=x
        if c==x9:x9=x
        print(x1,"!",x2,"!",x3)
        print("---------")
        print(x4,"!",x5,"!",x6)
        print("---------")
        print(x7,"!",x8,"!",x9)
        a=a+1
print("gg a celui qui a gagne")