Simulate C++ String Copy Operations

You are given a program written in a simplified C++ syntax. Each line of the program is one of the following two forms:

1. string variable_name(initializer);
2. string_view variable_name(initializer);

Here, variable_name is a unique identifier (its length is at most $10$) that has not appeared before. The initializer is either:

• A string literal enclosed in double quotes (for example, "abc"), or
• A previously declared variable name (for example, source) which refers to the content of that variable.

When assigning a string value $s$ to a variable of type string, the program performs exactly $|s|$ character copy operations (where $|s|$ is the length of the string). When assigning to a variable of type string_view, no character copy is performed.

Your task is to calculate the total number of character copy operations performed by the program.

Input Format: The first line contains an integer $n$ indicating the number of lines in the program. Each of the following $n$ lines is a declaration in one of the two forms described above.

Output Format: Output a single integer, the total number of character copy operations performed throughout the program.

Note: When the initializer is a previously declared variable, the assigned string is exactly the content of that variable.

inputFormat

The input begins with an integer n representing the number of lines in the program.

Each of the next n lines contains a variable declaration in one of the following forms:

• string variable_name(initializer);
• string_view variable_name(initializer);

The initializer is either a string literal (enclosed in double quotes) or a previously declared variable name.

outputFormat

Print a single line containing the total number of character copy operations performed.

sample

3
string a("abc");
string_view b(a);
string c(b);

6

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