3-1.py

visited = [(0, 0)]

with open('day3.txt', 'r') as f:
    s = f.readline()
    x, y = 0, 0
    for direction in s:
        if direction == '>':
            x += 1
        elif direction == '<':
            x -= 1
        elif direction == '^':
            y += 1
        elif direction == 'v':
            y -= 1
        visited.append((x, y))

print len(set(visited))