years = {"2013", "2014", "2015"}
base = set()
for i in range(1, 29):
    if i < 10:
        base.add("0" + str(i))
    else:
        base.add(str(i))
info1 = base.copy()
info1.add("29")
info1.add("30")
info2 = info1.copy()
info2.add("31")
months = {
    "02": base
}
for i in [4, 6, 9, 11]:
    if i < 10:
        months["0" + str(i)] = info1
    else:
        months[str(i)] = info1
for i in [1, 3, 5, 7, 8, 10, 12]:
    k = ("0" + str(i)) if i < 10 else str(i)
    months[k] = info2

s = input()

def solve(s, years, months):
    maps = {}
    words = s.split("-")
    i = 1
    while i < len(words) - 1:
        d, m, y = words[i-1][-2:], words[i], words[i+1]
        if y in years and m in months and d in months[m]:
            k = d + "-" + m + "-" + y
            maps[k] = maps.get(k, 0) + 1
        i += 1
    ans, count = "", 0
    for k, v in maps.items():
        if count < v:
            ans, count = k, v
    return ans 
    

ans = solve(s, years, months)
print(ans)
		 	  	 		     		 			    	  		