s2=''
    for i in s:
        if(i!=' '):
            s2+=i

    
    l=len(s2)
    root=l**(0.5)
    p=math.ceil(root)
    k=math.floor(root)
    innerlist=[]
    mainlist=[]
    ans=''
    for i in range(len(s2)):
        if(((i+1)%p)==0):
            innerlist.append(s2[i])
            mainlist.append(innerlist)
            innerlist=[]
            
            
        else:
            innerlist.append(s2[i])
    if(innerlist):
        mainlist.append(innerlist)
    for i in range(len(mainlist[0])):
        for j in range(len(mainlist)):
            if(i>=len(mainlist[j])):
                continue
            
            ans+=mainlist[j][i]
        ans+=' '
    return ans