- #include <iostream> 
- using namespace std; 
-   
- int main(){ 
-     int folder[10]={0}, sum=0; 
-     long long N; 
-   
-     cin >> N; 
- 	while (N!=0){ 
-         folder[N%10]++; 
-         N/=10; 
-     } 
- 	for (int j=0; j<10; j++) 
- 		if(folder[j]!=0)	sum++; 
-  	cout << "sum:" << sum; 
-   
-     return 0; 
- } 
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