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//#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int main(void)
{
char s1[100], s2[100], s3[100] = { 0 };
scanf("%s %s", s1, s2);
double len = strlen(s1);
int i, j = 0;
for (i = 0; i < len; i++)
{
if ((s1[i]>='0'&&s1[i]<='9') || (s1[i]>='a'&&s1[i]<='z' )|| (s1[i]>='A'&&s1[i]<='Z'))
s3[j] = '1';
else
s3[j] = '0';
j++;
}
int num = 0;
for (i = 0; i < len; i++)
if (s2[i] == s3[i])
num++;
printf("%.2f", 100.0*num / len);
printf("%%");
//putchar('%');
//putchar('\n');
//system("pause");
return 0;
}