#include<stdio.h>
#include<iostream>
#include<math.h>
#include<string.h>
#include<vector>
#include<string>
using namespace std;
typedef long long ll;
char c[5000000];
int ans;
bool isapha(char x){
if((x>='a'&&x<='z')||(x>='A'&&x<='Z'))return true;
else return false;
}
int main(){
while(cin.getline(c,5000000)){
ans=0;
bool f=0;
for(int i=0;i<strlen(c);i++){
if(isapha(c[i])&&f==0){
ans++;
f=1;
}
else if(!isapha(c[i])){
f=0;
}
}
cout<<ans<<endl;
}
return 0;
}
water || 算英文句子中单词个数
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