python

```cpp
import sys
def main():    
# 读取输入    
data = sys.stdin.read().splitlines()    
if len(data) < 2:        
return    
s1 = data[0].strip()  # 单词    
s2 = data[1]          # 文章，可能包含空格，保持原样
    target = s1.lower()    
n = len(s2)    
count = 0    
first_pos = -1    
i = 0    
while i < n:        
# 跳过空格        
if s2[i] == ' ':            
i += 1            
continue        
# 找到一个单词的起始        
start = i        
# 找单词结束        
while i < n and s2[i] != ' ':            
i += 1        
word = s2[start:i].lower()        
if word == target:            
            count += 1
```
