> #include<iostream>
> #include<cstring>
> using namespace std;
> 
> int map[256]={0};
> int main()
> {
> 	int i;
> //这里有点罗嗦了
> 	for(i='a';i<='z';i++)
> 		map[i]=0;
> 	for(i='A';i<='Z';i++)
> 		map[i]=0;
> 	
> 	map[5]=0;//it is ff
> 	map[6]=0;//it is fi
> 	map[7]=0;//it is fl
> 	map[8]=0;//it is ffi
> 	map[9]=0;//it is ffl
> 	
> 	
> 	char record[105];
> 	int count=0;
> 	
> 	while(cin>>record)
> 	{
> 		int len=strlen(record);
> 		for(i=0;i<len;i++)
> 		{
> 			// it is ``
> 			if(record[i]=='`' && record[i+1]=='`')
> 			{
> 				count++;
> 				i++;
> 				continue;
> 			}
> 			if(record[i]=='`')
> 			{
> 				count++;
> 				continue;
> 			}
> 			// it is ''
> 			if(record[i]=='\'' && record[i+1]=='\'')
> 			{
> 				count++;
> 				i++;
> 				continue;
> 			}
> 			if(record[i]=='\'')
> 			{
> 				count++;
> 				continue;
> 			}
> 			// it is ffi
> 			// it is ffl
> 			if(record[i]=='f' && record[i+1]=='f' && (record[i+2]=='i' || record[i+2]=='l'))
> 			{
> 				
> 				if(record[i+2]=='i')
> 				{
> 					if(map[8]==0)
> 						count++;
> 					map[8]=1;
> 				}
> 				else
> 				{
> 					if(map[9]==0)
> 						count++;
> 					map[9]=1;
> 				}				
> 				i=i+2;
> 				continue;
> 			}
> 			// it is ff fi fl
> 			if(record[i]=='f' && (record[i+1]=='f' || record[i+1]=='i' || record[i+1]=='l'))
> 			{
> 				if(record[i+1]=='f')
> 				{
> 					if(map[5]==0)
> 						count++;
> 					map[5]=1;
> 				}
> 				else if(record[i+1]=='i')
> 				{	
> 					if(map[6]==0)
> 						count++;
> 					map[6]=1;
> 				}
> 				else
> 				{	
> 					if(map[7]==0)
> 						count++;
> 					map[7]=1;
> 				}
> 				i++;
> 				continue;
> 			}
> 			
> 	
> 			if(map[(int)record[i]]!=1)
> 			{
> 				//cout<<"we have count  this number"<<endl;
> 				count++;
> 				map[(int)record[i]]=1;
> 			}
> 		}
> //		cout<<"this period is"<<count<<endl;
> 	}
> 	cout<<count<<endl;
> 	
> 	return 0;
> }