n = io.read("*n", "*l")
s = io.read()
a = string.find(s, " ")
first = string.sub(s, 1, a - 1)
pos = 1
for i = 1, n - 1 do a, b = string.find(s, " ", pos) pos = b + 1 end
len = string.len(s)
z = string.sub(s, pos, len)
print(string.format("%s/%s", z, first))