num = input()
num = (num[::-1])
print(num)
newnum = ""
for i in range(0, len(num)):
    if i == 0:
        newnum += num[i]
    elif (i) % 3 == 0:
        newnum += ","
        newnum += num[i]
    else:
        newnum += num[i]
print(newnum[::-1])