def encryption(s):
    # Write your code here
    s = s.replace(" ", "")
    n = len(s)
    st = []
    # rows = math.floor(math.sqrt(n))
    columns = math.ceil(math.sqrt(n))
    
    #  constraint given
    # if rows * columns < n:
    #     rows = columns
    
    for i in range(columns):
        temp = ''
        for j in range(i, n, columns):
            temp += s[j]
        st.append(temp)
    
    return " ".join(st)