找最长单词

s=input()
s1=''
for i in range(len(s)-1):
    s1+=s[i]
lt=s1.split()
ln=list()
for i in lt:
    ln.append(len(i))
 
m=0
for i in range(len(ln)):
    if ln[i] > ln[m]:
        m= i
print(lt[m])