n = input()
n = n.lower()
m = list(n)
x = “”
for i in range(0,len(m)):
    if m[i]==”a” or m[i]==”o” or m[i]==”y”:
        m[i] = “0”
    if m[i]==”e” or m[i]==”u” or m[i]==”i”:
        m[i] = “0”

for j in range(0,len(m)):
    if m[j] != “0”:
        x = x + “.” + m[j]
print(x)