a,b=map(int,input().split())
k=[]
x=[]
s=b//2//2
p=b//2+b%2
for i in range(a):
d=list(input().split())
if d[0] == '<CENTER>' or d[0] == '</CENTER>' or d[0] == '<RIGHT>' or d[0] == '</RIGHT>':
x.append(d)
else:
k.append(d)
for i in range(len(k)):
for j in range(len(k[i])):
print('_' * (s), k[i][j], '_' * (s + 1))