VISITED = {}
EDGES = {}

RESULT = []

def dfs(x: int):
    global VISITED, EDGES, RESULT
    VISITED[x] = True
    for y in (EDGES.get(x) or []):
        if not VISITED.get(y):
            dfs(y)
    RESULT.append(x)

with open('sortaret.in', 'r') as f:
    
    n, m = map(int, f.readline().split())
    for i in range(m):
        x, y = map(int, f.readline().split())
        EDGES.setdefault(x, []).append(y)
    dfs(1)
    
    g = open('sortaret.out', 'w')
    while len(RESULT) > 0:
        g.write(str(RESULT.pop()) + " ")

    g.close()