py

```python```
def find_first_unique_char(s):
    char_count = {}
    for char in s:
        if char in char_count:
            char_count[char] += 1
        else:
            char_count[char] = 1
    for char in s:
        if char_count[char] == 1:
            return char
    return 'no'
 
# 测试代码
input_str = input()
print(find_first_unique_char(input_str))