Given a one word lowercase string txt, return another string such that even-indexed and odd-indexed characters are grouped and groups are space-separated.

Examples

even_odd_string("mubashir") ➞ "mbsi uahr"
# Letters at even indexes = "mbsi"
# Letters at odd indexes = "uahr"
# Join both strings with a space

even_odd_string("edabit") ➞ "eai dbt"

even_odd_string("airforce") ➞ "aroc ifre"

Notes

There will be no space in the given string.