#include<stdio.h>

#include<string.h>

int main()

{

int t;

scanf("%d",&t);

while (t--)

{

char s[1011];

scanf("%s", s);

int len = strlen(s);

int a[26] = { 0 };

char b[27] = "abcdefghijklmnopqrstuvwxyz";

for (int i = 0; i < len; i++)

{

for (int j = 0; j < 26; j++)

{

if (s[i] == b[j])

{

a[j]++;

}

}

}

int max = a[0];

int m = 0;

for (int i = 1; i < 26; i++)

{

if (max < a[i])

{

max = a[i];

m= i;

}

}

printf("%c\n", b[m]);

}

return 0;

}