For loop exercises
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# For loop exercises
1. A string contains either the signs `+`, `-` or `0`. Declare an integer with
the initial value of 1. On every `+` in the string, add 1. On every `-`,
subtract 1. On every zero, make the integer be equal zero. After the last
symbol, write the value on the screen.
2. Change the previous program so that the `!` symbol calculates the factorial
of the current value of the integer and saves it in the integer.
3. Copy every second letter of a string into another string and display on the
screen.
4. Copy every second word of a string into another string.