import sys

data = sys.stdin.read().split()
if not data:
    exit()
n = int(data[0])
m = int(data[1])
ans = []
for i in range(n):
    ans.extend(list(data[2 + i]))
q = [0] * (n * m)
head = 0
tail = 0
for c in range(m):
    if ans[c] == '.':
        ans[c] = '^'
        q[tail] = c
        tail += 1
for c in range(m):
    pos = (n - 1) * m + c
    if ans[pos] == '.':
        ans[pos] = 'v'
        q[tail] = pos
        tail += 1
for r in range(n):
    pos = r * m
    if ans[pos] == '.':
        ans[pos] = '<'
        q[tail] = pos
        tail += 1
for r in range(n):
    pos = r * m + (m - 1)
    if ans[pos] == '.':
        ans[pos] = '>'
        q[tail] = pos
        tail += 1
while head < tail:
    pos = q[head]
    head += 1    
    r = pos // m
    c = pos % m
    if r > 0:
        npos = pos - m
        if ans[npos] == '.':
            ans[npos] = 'v'
            q[tail] = npos
            tail += 1
    if r < n - 1:
        npos = pos + m
        if ans[npos] == '.':
            ans[npos] = '^'
            q[tail] = npos
            tail += 1
    if c > 0:
        npos = pos - 1
        if ans[npos] == '.':
            ans[npos] = '>'
            q[tail] = npos
            tail += 1
    if c < m - 1:
        npos = pos + 1
        if ans[npos] == '.':
            ans[npos] = '<'
            q[tail] = npos
            tail += 1

out = []
for r in range(n):
    out.append("".join(ans[r * m : (r + 1) * m]))
print("\n".join(out))