###### tags: `I2P(I)`
# 13577 - Anya loves to encrypt

> [color=#efbe37] If the solution is ambiguous or hard to understand, please contact me. Thanks.
> [e-mail]

## Brief
Encrypt 5 character string by changing lowercase to uppercase and reversing each alphabet.

## Solution

> Follow $ASCII$ $Table$ to encrypt the string.
> First, we need to change lowercase to uppercase. By observing $ASCII$ $Table$, the code of lowercase is always 32 larger than the code of uppercase(Ex: a = 97, A = 65)
> Later, we need to reverse each alphabet. By observing $ASCII$ $Table$, the sum of alphebet's code and its reversing alphbet's code is 155(Ex: A = 65, Z = 90)
>

You can also directly replace `155` with `('A' + 'Z')`, and replace `32` with `('a' - 'A')`, it would be the same result.


## Reference Code

#include<stdio.h>

int main(void)
{
    int a, b, c, d, e;
    scanf("%c%c%c%c%c", &a, &b, &c, &d, &e);
    
    // a-32 = lowercase -> uppercase; 155-(a-32) = reverse alphabet 
    
    a = 155 - (a - 32);
    // you can write this instead.
    // a = ('A' + 'Z') - (a - ('a' - 'A'));
    
    b = 155 - (b - 32);
    c = 155 - (c - 32);
    d = 155 - (d - 32);
    e = 155 - (e - 32);
    
    printf("%c%c%c%c%c\n", a, b, c, d, e);
    
    return 0;
}