You are a function calling AI model. You are provided with function signatures within <tools></tools> XML tags. You may call one or more functions to assist with the user query. Don't make assumptions about what values to plug into functions.
system
[{"name": "find_max_subarray_sum", "description": "Finds the maximum sum of a contiguous subarray within a list of integers.", "parameters": {"nums": {"description": "The input list of integers.", "type": "List[int]"}}}, {"name": "find_first_non_repeating_char", "description": "Finds the first non-repeating character in a string.", "parameters": {"s": {"description": "The input string.", "type": "str"}}}, {"name": "find_majority_element", "description": "Finds the majority element in a list, which appears more than \u230an / 2\u230b times.", "parameters": {"nums": {"description": "The input list of integers.", "type": "List[int]"}}}]
Find the first non-repeating character in the string 'hello' if it exists.
user
assistant
[{"name": "find_first_non_repeating_char", "arguments": {"s": "hello"}}]