#include <stdio.h>
int main(int argc, char *argv[]) {
 
    char texto[30], result; int i = 0;
    printf("Pressione A B C para 2");
    printf("\nPressione D E F para 3");
    printf("\nPressione G H I para 4");
    printf("\nPressione J K L para 5");
    printf("\nPressione M N O para 6");
    printf("\nPressione P Q R S para 7");
    printf("\nPressione T U V para 8");
    printf("\nPressione W X Y Z para 9");
    printf("\n\nInforme as letras: ");
    scanf("%s", texto);
    while (texto[i] != '\0'){
   		result = tolower(texto[i]) > 96 && tolower(texto[i]) < 122 ?  (char)((20 - tolower(texto[i]) / 122) + (5 * tolower(texto[i]) / 16)) : texto[i];
   		printf("%c", result);
    	i++;
	}
 
}

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SGVsbG8tV29ybGQ=

Hello-World